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Are any of the following correct?

It's all too-easy
It's all-too-easy
It's all too easy

Explanation/citations would be greatly appreciated

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There is no need to hyphenate the phrase unless it is used either as a compound noun or as a compound adjective.

As a compound noun, it is likely to be a nickname, in which case, capitalise the initial letters:

  • It's All-Too-Easy (as in names such as John-Paul, or Maria-Luisa)
  • It's 'All Too Easy' (as a nickname) and It's All Too Easy (as a non-hyphenated name) would both also be acceptable.

As a compound adjective, it would need a determiner before it, e.g.,

  • It's the all-too-easy solution to all our problems. Don't you believe it.

ADDITION:

In the plural, eg 'all-too-easy solutions' no determiner is needed, as Kris commented, below.

  • Yes, it's an all too easy and not entirely fair game to play. (NYT) – anongoodnurse Feb 12 '14 at 6:15
  • Compound adjectives do not necessarily need a determiner before them. All-too-easy solutions are always too easy to work. – Kris Feb 12 '14 at 7:08
  • @Kris - thanks - I've updated to reflect your comment. – Leon Conrad Feb 12 '14 at 12:06
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There would be no hyphen involved. I assume you're thinking of the linking of two adjectives, but that's only when they come before a noun. If you want to read more rules about hyphens, read here:

http://www.grammarbook.com/punctuation/hyphens.asp

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